Fix docker-entrypoint.sh loadmodule twice

[hieu2102]

This PR fix #468

If redis container is started with a config file, the current docker-entrypoint.sh script will still generate the redis-server command with --loadmodule flag.
If a CONFIG REWRITE is issued (for example, by Sentinel client), the loadmodule entries will be written to the config file. Restarting the container will then result in a module initialization error (due to modules being loaded twice).

This PR add a check to skip --loadmodule flag if the container is started with a config file, and the loadmodule $module entry is already present.

[jit-ci]

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